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Ubuntu Security Notice USN-5168-4

Ubuntu Security Notice USN-5168-4
Posted Dec 8, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5168-4 - USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced a regression that could break SSL connections. This update fixes the problem. Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS signatures. A remote attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-43527
SHA-256 | cd759c4921163b4522254a171ff6f8453bdd0d3356341318e777e4577202c35e

Ubuntu Security Notice USN-5168-4

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5168-4
December 07, 2021

nss regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

USN-5168-3 introduced a regression in NSS.

Software Description:
- nss: Network Security Service library

Details:

USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced
a regression that could break SSL connections. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS
signatures. A remote attacker could use this issue to cause NSS to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
libnss3 2:3.28.4-0ubuntu0.16.04.14+esm2

Ubuntu 14.04 ESM:
libnss3 2:3.28.4-0ubuntu0.14.04.5+esm10

After a standard system update you need to restart any applications that
use NSS, such as Evolution, to make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5168-4
https://ubuntu.com/security/notices/USN-5168-1
CVE-2021-43527
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